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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d56594c4d8ef546425c1990782922f83d103c2c4edd1f181919db1d706fe220' 
  AND token = 'zG+etkpcKrm+Lj5YlYthbdzVdhmN2uZrt2kktICuZX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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