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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee14e533b68b53dd74d431c9aabb944753c30c004d6a14402526ab7f3fdbe01' 
  AND token = 'NFMA2eydR6ibGMkBWeG9J2XaJnheahKSS1JvllZ2P44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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