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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894b8d6462e10c3ed75f411bf5ce5d711f92838ecfa9afa9031758c160d2fbfc' 
  AND token = 'u65MsqDpXOsahS2rbh9yfKGmlb5BjFQ3auWSy+l+A3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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