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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a98727f18bc69efd6d4a780fbd0f00486f46c49d44bf46cca04e4a7a76dcf6d' 
  AND token = 'qacjLOTZund2IcK0/MoRZvzkhRxX3eSRh9aI2Dyl/Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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