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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd3af9d92eaf48b0a7e72ecdb0d9f9a4e0b72df4aaac593e9a75eae9b686f89' 
  AND token = 'k2OPd9w0SGZkoxTC2vf1hYRQ6SnFPmjilmHU0emie4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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