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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d0435e5fc3997e3b7591a94b0cc05c74270fb72b44c5d95e683360e289a928' 
  AND token = '1L4jZKbwpzFlfZYRft9xQS75LvsvZukEpSOT9xolY08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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