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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61158cb595b25c13f2124fddcfb081216f495a2c0c2d40b45dc24fe97c77f162' 
  AND token = 'xTmrjPXSfhQ0RhvCsNct6pOhNW+Yej8UGDUkthwBCy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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