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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd18314bc9d707986fdcfd9c967c687bc24fd094c83e28dc35e00860597a02ca' 
  AND token = 'gbajYWL7jgVmhYITMJr/f2cP+L9iIurlln4ocV6Ww7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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