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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c312c966e9974c22140d67cfa7af68c41b0d5e2912079a64d8c286aa90f207e6' 
  AND token = 'LKCuou3Hq238e9yLy5lMXFegLijnxMBXy/mBsedPgnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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