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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f79d12d2ede167f731ed7d68bf5a24b7a3d9f73ba0f581ac03cbd625f536427' 
  AND token = 'rYbdly5D0AG43p3l42KIB4tHUhlFRUdDaiMY5VOFY60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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