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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cf650254a700180372ecef31026973f7e29c40ce8f7d6e3d5517e4ffa5edd0' 
  AND token = 'PbP3NM6WxwFyumNzsreKF9abhKGcZpwG2XO08boBdWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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