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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca5637e8f363cfdad9b04ec9747d0baab86ea272e7f19c4e7f1e9e1bda7ea6b' 
  AND token = 'moQrO7oAqu2EoC1v3GgMOR07S4LL/uOXzirtsWKOKb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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