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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c37dc32f7df3b47e3b0f7e21fea0d8aeaaa4fc2616670f60e0b1e86663ffd3b' 
  AND token = 'cua+qdcfVM5NrJJ1UJ39dyskyCViEsvz4ivHPfn0Zmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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