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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd875f4f0315b810afb73e847fcf6d384234c60ad73d7e912ce9bedf995473c' 
  AND token = '6aPOR7ZXI3/Oc4ROCV7LHwEjSa1YbLh+6sOt5szjLZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}