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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4102eb5c7299d5538ee9b98809b69264c731b988638d376b872696892adcdba7' 
  AND token = '/Cr2oe0O6necDI3876ySnQ9HSVMI27YMMWVVbJzLjiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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