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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97dfcb6cd98c55082ec3db1b4176eec8a8ab62f8607ac46b9a41ffd6e633579e' 
  AND token = 'iQdDfXJPSKT3Qm0MmW59u3ze8esxS4jgn4+NCfvH3W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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