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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a392c1a04d453cbe3b185ff328e49d1d77b1e21fbeb54a51f1d20873fb4fcd41' 
  AND token = 'Gk06CXoYZh5GAovWCkwjJ95EAkVRI8lQaVMtuuXyLyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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