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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34048c9d6b272ce9d5597d91876c8e3b5bfc2311fd401e5f016e6b276e4508c' 
  AND token = '8/r6qQ0Owoa2jrtAX26fli8syIWBaJmK/0Hm79XYdoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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