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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e52eb6b84a14a886b1fbd12cc62bf4586adcceed2ce9822af08a2ed20d0a8d' 
  AND token = 'Bul1tpFneOVf2RVZpoKbUl1rv4y2sem2G+Dt5qJ1tpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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