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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fdc530977d1c0b2c5bd8c13ad025d804342f0d07d2df3175c60ea0c9a7b6fe' 
  AND token = 'ObP1rPLF6t69iUyplhSdblZa9849y219fgY4EVB4bVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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