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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bc33e60da90433de122ee6ff1e8698e3f044cb67df991a0a13676492f21afe' 
  AND token = '62p36fn2p1kCkpPqPOO6edWL69iuYRtHPpq0gNgb8XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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