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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb65c154d8d292aecbdcc7c81dbdce056f19243cd580e11564f4bf30c3f9e7c' 
  AND token = 'U1QgLEtXQgQd+1hoeKPbUN6W7uO9grVVxVqUCb8VNbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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