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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6f02920093d9176d6cbfdaad6bb7ad1acd05ff43427c7f70bd8ba5efb2004c' 
  AND token = 'GGLK/s/AMMwzT+9UXIpIkoacNy+1+rjOvzQXy+XxIF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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