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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b92712737dfadf9bf3978771694a1b83045030a60fdd98fd3ac3841e0ea463a' 
  AND token = 'mZs7D0UR39qVey5nQCiVkCzWME6W7qfgXgJ3i9gReeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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