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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2512bca388d2f86929187dda5bf85219b2e9ae976731004ab83fea8f86e09c3' 
  AND token = '0FACJfKQrYE4hsVfayXmrNBO7iU/+Oww3V0mG5aMCO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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