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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0be3c0e73d1cf09a3d6adf2295f4fe2213a98b9dd352480e95ede49402745ae' 
  AND token = 'UGoZt6UDNnuTglCw7gDHvgB/3vH4PMSTGWjbiua5xwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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