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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f67e814015b6b21d015306cde7be1308fe6abacfca448964cd81459ff5f5abc' 
  AND token = 'vNIrPqbljt41fl/bvhZcUIyrgon0d/h3LBbjwTyNz0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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