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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15763d8db74bacb00ee826e913e563e70e3999d9daeb5d6afd27087462ba656c' 
  AND token = 'N8swxclOgO88CkXK5NJ9biOhvKf1gxoKvotk0otc2tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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