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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ffde5b946704911e12383fa15e8c005c83fe53a6b0bad4cd2e9d1a8da8850a' 
  AND token = '8F3CyLXyE1TuAR+Ht5/0uJWNQRiHKHdWLz/f6bIL7f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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