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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154d4f4e60b3cf06ef65ddeef6302b5500093061334e83b38267ee94e63d5d1e' 
  AND token = 'OV6r7+ArWPLzBJMk4TgCNp6QU/Ilx411AayWuviJ7EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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