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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c2a3a7a8b164ba111cf0df17a65268c81715e26f22f9915dda75720c56f64c' 
  AND token = 'ccAxdCnSqOaGhJPr5/YfXZAi8qiw8lMDx/izfpmc7Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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