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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbd559fa29eee14148f27c9396300b8cc6314bbf7ff717e594e8b240f2c92e8' 
  AND token = 'iTTsvKDW/eKJKhtId5P+sdKIpsp7c8bqL2H5fYldis4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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