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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d56d1d506452f35a60081bd1999cfb0a782e426e63cf0165e038c4d6cbe6870' 
  AND token = 'k8z4uwLg1K0tvqm75RUxw3QAhANW0GxYPJcPoYEAajI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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