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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51360ef6543e884584443040b0de46169a87ea414e262feda1f28ec5ad06510b' 
  AND token = 'Xrkd2+gU+cXykuZtAhYiJfR81W3gXQL8WLn3/n/8Vuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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