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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b04a6c988a17a053beb6633c74bb5f5d44a42c91be3491541efdd4c2c56114' 
  AND token = '1lJ3mYzchZ13nX38N9PuAGjS8IaPmWiUzRUiZ1Bpq4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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