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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffdf162e3080eaa0dd7a1b86f5a9eab39338b5e6e5055e74ff349b2a3cbaed7' 
  AND token = 'XN7wbv1itNaL0iEjMQ9IfnmrfGN4d+7xRfTdU7ba904=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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