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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58df1ef62c12e870b6da5c1dd96f724601f6f8ac95b9accfa6ee8a202cfd09f6' 
  AND token = 'c6M30zen3orlColS7q+v6k/+z8IydWW7qHo5mS7s2hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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