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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d42d956a098a016b33edf407e806cf99d57987bfbb22c587a982d22e6482b2' 
  AND token = 'o0cRbziMqoqTYR17IDUZIkleDk9b8mJ/qO7q6yXtny4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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