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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08db2fc976499215ee7c289f75f50877539e3aceff7b322c7262645931bb7dba' 
  AND token = 'S9RluvTJefHoDGI6gr20kY52Osq8SPOgjBDYTeyb+ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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