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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f377b6b68e53c5ffc847ac6e17e9b91edaec9356ff0ffbdbe0ef03d1b9a9789' 
  AND token = 'aJrHddxtTdDqoBJRIhXKce5XY5le+U3oMr8dlsZEWHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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