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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51114e246d15ef348a0b8e5d5c59328f8e23b6066f8a0616c21ad817cce3d992' 
  AND token = 'l10EWo10Ay7Ic0P2891X4chUPgCmzOSAqRtcrX7RMmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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