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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c076b6804ac75ffe7366eb15ebdb2fea4f496dbfbe02732aa60eb04f4a2cdf6e' 
  AND token = 'vwc6twPGT9vRRsL8g0lc9vg233JzlKdZtwpf6aCo6SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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