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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3144b7684576ff6b0742370bea92faaba19330b1827f5f9ee2187c8acefd3c9' 
  AND token = 'VwiLStT6d8UQ5T3Fc97t259H4ceKQ322tc8lINtj0K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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