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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3112db1bbd8e51d22b14225ff6c946d561a2b058f152a9833b1961cddee95908' 
  AND token = '6wYhrvSxKbNIqc1qMHbG+WTI/w2sT8twXArV78zOz7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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