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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660366991136b10d768eee4ecaaf41fa11a90f0af1c7d0183404665c25ff6c57' 
  AND token = 's5bgQJE8t0A6KtpBM75OZB6R4ITprejhZfEkv3Q7KZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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