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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6843c7d5baf39edceaa85da1022ec21e62d7fbc5780c11ee07d6d7a3966b9c' 
  AND token = 'jssegWdAQY+w3m+arAAuhBqdsBTqHeepc9rOi3bybN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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